Wastewater treatment plant construction work
The Contract comprises the design, procurement, construction and commissioning of a new process treatment facility to achieve a lower final effluent (FE) ammonia consent at Davyhulme Waste Water Treatment Works (WwTW), Manchester.
UK-Warrington: wastewater treatment plant construction work
Contract notice – utilities
Section I: Contracting entity
United Utilities Water plc
Clearwater 4, Lingley Green Business Park, Lingley Green Avenue, Great Sankey
Contact point(s): UK Warrington
For the attention of: Alison Ardrey
WA5 3UZ Warrington
Telephone: +44 1925773287
Fax: +44 1925773253
General address of the contracting entity: www.unitedutilities.co.uk
Electronic access to information: Interested parties are required to complete a pre-qualification questionnaire which can be located at the following URL address http://amp5.uudataroom.com/login.asp Login: Davyhulme Password: WFD
Further information can be obtained from: The above mentioned contact point(s)
Tenders or requests to participate must be sent to: The above mentioned contact point(s)
Section II: Object of the contract
Design and execution
NUTS code UKD
The Contract comprises the design, procurement, construction and commissioning of a new process treatment facility to achieve a lower final effluent (FE) ammonia consent at Davyhulme Waste Water Treatment Works (WwTW), Manchester. Note: dependant on the type of treatment process selected there may be a requirement for the Contractor to provide an extended period of Client training and / or assistance to optimise plant performance.
Davyhulme is United Utilities largest WwTW, treating wastewater from a population equivalent of about 1.1 million from the Greater Manchester conurbation. Davyhulme discharges its final effluent (FE) to the Manchester Ship Canal. The current FE consent is 20mg/l BOD, 30mg/l SS and 3mg/l NH3 (on a 95 %ile basis) and 75 % overall COD removal across the whole WwTW. The future consent will be 20mg/l BOD, 30mg/l SS and 1mg/l NH3 (on a 95 %ile basis) and 75 % overall COD removal across the whole WwTW.
The future FE consent is driven by Davyhulme’s inclusion in the National Environment Programme as a result of the receiving Manchester Ship Canal being designated under the Freshwater Fish Directive in 2003. This revised consent will also meet the requirements of the Water Framework Directive.
Background current operation.
Davyhulme WwTW consists of two parallel treatment streams (ASP1 and ASP2) downstream of a common inlet sewer. Both ASP1 and ASP2 streams have preliminary screening and grit removal, primary settlement prior to non nitrifying aeration tanks (provided with surface aeration) and final settlement. The flow split to ASP1 and ASP2 is 45 % and 55 % respectively. The effluent from the ASP1 and ASP2 final settlement tanks is treated together in a common tertiary biological aerated flooded filter (BAFF) for nitrification, from which final effluent (FE) is discharged to the Manchester Ship Canal. The consented WwTW flow to full treatment (FTFT) and dry weather flow (DWF) are 714Ml/d and 340Ml/d respectively. This site is in an odour sensitive area and has two odour control plants serving the inlet works, ASP1 primary settlement tanks and aeration tanks and raw sludge treatment and storage.
Sludge treatment at Davyhulme WwTW is currently undergoing refurbishment and expansion as part of the Sludge Balanced Asset Programme (SBAP) project to treat raw sludge up to 91 000 tonnes dry solids sludge per annum (TDSPA). The major components of SBAP are a reception / screening facility of indigenous sludge, followed by thickening of indigenous and imported liquid sludge and a reception / storage facility for sludge cake imports. Sludge is subject to digestion pre-treatment by thermal hydrolysis followed by mesophilic anaerobic digestion. Digested sludge may either be dewatered, using centrifuges and exported to land or transferred to the United Utilities Shell Green incineration facility via the Mersey Valley Sludge Pipeline (MVSP).
The dewatering centrifuges will produce between 16 000 and 32 000 tdspa of thermally hydrolysed digested sludge cake. The centrate from the dewatering centrifuges will be treated in a dissolved air flotation (DAF) plant (to remove excess suspended solids) and stored in a balancing tank. It will then return to the ASP1 stream before either primary settlement tanks, aeration tanks or final settlement tanks.
The sludge treatment operations are managed via a permit under the Environmental Permitting regulations (EPR). The permit details discharge limits and sampling requirements for all solid, liquid and gas emissions from Davyhulme WwTW, for existing and SBAP sludge treatment operations. A major variation to the existing licence will be negotiated with the EA to incorporate the new process treatment facility.
Due to strategic importance of Davyhulme WwTW as a part of the Company’s wastewater treatment facilities no unauthorised disruption to the existing plant shall be allowed throughout the construction and commissioning process. The operation and throughput of the existing plant must therefore be maintained at the current level throughout the construction period.
Related contracts (outside the scope of this tender process).
Scope of Contract covered by this OJEU notice.
Interested parties should be aware that United Utilities fall within a regulated environment and as such a number of regulatory and standards must be maintained in relation to the activities.
The following information contains details of the alternative solution covered by this Contract Notice with a further two additional options that may or may not be required:
1. A new Activated sludge plant 3 (ASP3) is required to replace one of the existing ASP streams (ASP1, or ASP2). The new ASP3 Stream shall treat 60 % of incoming flows and shall solely receive and treat the SBAP dewatered centrate liquors. It shall be assumed that 60 % of the SBAP thickened sludge liquors shall enter ASP3;
2. A new inlet works may also be required as part of the scope of works, which would replace the existing ASP2 inlet works and reduce flow to the existing ASP1 / storm inlet works. The new Inlet Works will receive flows up to the consented FTFT of 714Ml/d. Flows in excess of 714 Ml/d will spill to the existing ASP1 / storm inlet works and gravitate to the existing storm tanks. Control of flows to the new ASP3 and the retained existing ASP will be downstream of the new inlet works;
3. Refurbishment of the plant and equipment on the retained existing ASP stream may also be required as part of the scope of works.
It is envisaged that the new ASP3 stream will consist of primary settlement tanks (PST), Fine bubble diffused air (FBDA) type ASP, final settlement tanks (FST) and mechanical thickening of Surplus Activated Sludge (SAS). It will be required to produce a treated effluent to meet the future FE consent. FE from the new ASP3 Stream is envisaged to re-join the existing final effluent culvert, prior to discharge into the Manchester Ship Canal. The new treatment facility shall be totally independent of the existing BAFF and therefore the BAFF must not form part of any proposed solution.
It is envisaged that the new Inlet Works will consist of a diversion chamber on the existing inlet sewer, storm overflow structure, FTFT flow control, course and fine screens, bypass, grit removal, and associated infrastructure.
It is anticipated that odour abatement technologies shall be required for the more odorous technologies.
It is anticipated this contract will generally incorporate the following:
Design, construction and commissioning of the new works.
The new works are expected to include but not be limited to the following:
Primary settlement tanks (PST);
Activated Sludge Plant (FBDA);
Final settlement tanks (FST).
Mechanical thickening of surplus activated sludge (SAS);
Works to ensure compliance with the requirements of the EPR permit;
Internal site roads within the new treatment facility areas;
New site access road from the new treatment facility to a new site entrance;
Construction of a new primary sub-station building;
Modifications to existing site high voltage electrical infrastructure;
Ancillary and accommodation works – site drainage and return;
Electrical instrumentation control and automation (EICA) and a distributed control system (DCS);
Inlet works (FTFT only (optional);
Refurbishment of the retained existing ASP stream (optional).
Estimated value excluding VAT
Range: between 123 000 000 and 171 000 000 GBP
Description of these options: Refer to section II.1.5).
Section III: Legal, economic, financial and technical information
i) Contractual joint venture with joint and several liability under English Law;
ii) Corporate joint venture;
iii) Contractor / subcontractor (s) relationship.
Where a company representing a consortia, alliance or joint venture expresses an interest, the company who responds to this notice will be deemed to be the lead bidder to whom all communications will be addressed.
Subcontracting will be permitted.
Section IV: Procedure
Some candidates have already been selected (if appropriate under certain types of negotiated procedures): no
Authorised representative of United Utilities Water plc.
Section VI: Complementary information
Interested parties are invited to an introductory presentation to be held at the Best Western Everglades Park Hotel, Derby Road, Widnes WA8 3UJ on Monday 26.11.2012 commencing 10:00 am. Interested parties are to confirm no later than close of business Thursday 22.11.2012 their intention to attend.
The Utilities Contracts Regulations (SI 2006 N° 6) provide for aggrieved parties who have been harmed or are at risk of harm by a breach of the rules to take action in the High Court (England, Wales, and Northern Ireland).
VI.5)Date of dispatch of this notice:9.11.2012